74% (1978)

62% (1986)

63% (1990)

73% (1978)

71% (1992)

56% (1987)

66% (1990)

62% (2008)

71% (1993)

76% (1982)

66% (1990)

33% (1978)

58% (1991)

72% (1979)

63% (1980)

50% (1976)

57% (1977)

57% (1988)

66% (1997)

52% (1982)